Re: [Nbd] [PATCH] doc: Restore a lost sentence about NBD_REP_ERR_BLOCK_SIZE_REQD

[Alex Bligh <alex@...872...>]

Eric,

On 28 Apr 2016, at 23:07, Eric Blake <eblake@...696...> wrote:

> The previous patch accidentally dropped the suggestion that a
> server replying with NBD_REP_ERR_BLOCK_SIZE_REQD should first
> send NBD_REP_INFO with NBD_INFO_BLOCK_SIZE, so that the client
> doesn't have to do yet another round trip NBD_OPT_INFO to learn
> what sizes the server plans to enforce.

Thanks.

I applied something slightly different that fixes the same issue.

Alex

> 
> Signed-off-by: Eric Blake <eblake@...696...>
> ---
> 
> extension-info branch
> 
> doc/proto.md | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/doc/proto.md b/doc/proto.md
> index 1a0f1cf..da65df0 100644
> --- a/doc/proto.md
> +++ b/doc/proto.md
> @@ -949,12 +949,13 @@ of the newstyle negotiation.
>     - `NBD_REP_ERR_BLOCK_SIZE_REQD`: The server requires the client to
>       request block size constraints using `NBD_INFO_BLOCK_SIZE` prior
>       to entering transmission phase, because the server will be using
> -      non-default block sizes constraints. The server MUST NOT send this
> -      error if block size constraints were requested with
> -      `NBD_INFO_BLOCK_SIZE` with the `NBD_OPT_INFO` or `NBD_OPT_GO`
> -      request. The server SHOULD NOT send this error if it is using
> -      default block size constraints or block size constraints
> -      negotiated out of band.
> +      non-default block sizes constraints. The server SHOULD first
> +      send at least an `NBD_INFO_BLOCK_SIZE` information reply before
> +      giving this error.  The server MUST NOT send this error if block
> +      size constraints were requested with `NBD_INFO_BLOCK_SIZE` with
> +      the `NBD_OPT_INFO` or `NBD_OPT_GO` request. The server SHOULD
> +      NOT send this error if it is using default block size
> +      constraints or block size constraints negotiated out of band.
> 
>     Additionally, if TLS has not been initiated, the server MAY reply
>     with `NBD_REP_ERR_TLS_REQD` (instead of `NBD_REP_ERR_UNKNOWN`) to
> -- 
> 2.5.5
> 
> 
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-- 
Alex Bligh